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Effect of yohimbine (Yoh) on morphine-induced conditioned place preference. Rats were treated i.p. with morphine (5 mg kg−1, n=20) or with a mixture of morphine (5 mg kg−1) and yohimbine (2 mg kg−1, n=9) Bars represent mean±s.e.mean. *P<0.05 with respect to the drug-paired compartment.
